juko | ad9d5becbc0b9fd4d83509a2c77245ce5f2255b7a92ad8abf90590c71ce869a3

General

Target
2026-08-09_aa5eac1e27f89ab2c82fc4511ddd2fa2_elex_wannacry.exe
Size 49KB
Sample260809-lya29shh57
SHA256 ad9d5becbc0b9fd4d83509a2c77245ce5f2255b7a92ad8abf90590c71ce869a3
MD5 aa5eac1e27f89ab2c82fc4511ddd2fa2
SHA1 6b74ac77e6279ede1ef4be6c8fea2afd5742baa6
SHA512 266141a500fb38c62df6f5f4969307db3bdead69d7f0489ee8e9879284ee5a89f3a21a3181cb0b8cb55072c1c0d663a5c8681f8e1e49aa2a24abf9f87ddc2238
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2E:4Ly2Kerc64CiGImVu8p4kojWh2E
TLSH
T1FC334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/240-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/240-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5984-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0006000000016cbe-13.dat	family_juko
behavioral2/memory/2192-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2192-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5984	WINWORD.exe
2192	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1738198120-2966725515-3980530802-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
5516	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_aa5eac1e27f89ab2c82fc4511ddd2fa2_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
5544	PING.EXE
1804	PING.EXE
5880	PING.EXE
5516	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5544	PING.EXE
1804	PING.EXE
5880	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 240 wrote to memory of 5984	240	2026-08-09_aa5eac1e27f89ab2c82fc4511ddd2fa2_elex_wannacry.exe	89
PID 5984 wrote to memory of 5516	5984	WINWORD.exe	90
PID 5516 wrote to memory of 5544	5516	cmd.exe	92
PID 5516 wrote to memory of 1804	5516	cmd.exe	93
PID 5516 wrote to memory of 5880	5516	cmd.exe	94
PID 5516 wrote to memory of 2192	5516	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_aa5eac1e27f89ab2c82fc4511ddd2fa2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_aa5eac1e27f89ab2c82fc4511ddd2fa2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:240
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5984
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00000482" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5516
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5544
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:1804
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5880
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:2192

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00000482

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000482
Size 49KB
SHA256 e70c59a8817c31e5206a9a315a3001b8c442c4900f2ba8535d505d886d86300e
MD5 c7d6fde8877c73f2f60f735bfcdedcb9
SHA1 3180d815fc79ee631ea10768d065cfda5ba4df6a
SHA512 1b0ec86d91fe65c43a61d393d6357e005cb9abba418239fdb98f04b74204c0816506fc8dc31ebb39e43dc9778c865fe74010bee861b4e9e4a3aca220bcf338a5
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2h:4Ly2Kerc64CiGImVu8p4kojWh2h
TLSH
T183334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 ad9d5becbc0b9fd4d83509a2c77245ce5f2255b7a92ad8abf90590c71ce869a3
MD5 aa5eac1e27f89ab2c82fc4511ddd2fa2
SHA1 6b74ac77e6279ede1ef4be6c8fea2afd5742baa6
SHA512 266141a500fb38c62df6f5f4969307db3bdead69d7f0489ee8e9879284ee5a89f3a21a3181cb0b8cb55072c1c0d663a5c8681f8e1e49aa2a24abf9f87ddc2238
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2E:4Ly2Kerc64CiGImVu8p4kojWh2E
TLSH
T1FC334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/240-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/240-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2192-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2192-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5984-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads